Air compressor



, 3 Sheets-Sheet 1. L. S. Cl-IIGHESTER.

( Model.)

AIR COMPRESSOR.

ATTORNEYS;

Patented Jan. 12

3 -Sheets-Sheet 2. L S. CH-IOHESTER.

(No Model.)'

AIR COMPRESSOR.

R ffl' BY ENEYS.

Patented Jan. 12, 1886.

WITNESSES j (544% 7? (No Model.) L. S. 3 SheesSheet 3.

AIR COMPRESSOR.

Patented Jan. .12, 1886.

INVENTOR ATTORNEYS.-

'IIIIIJMIIJIIIIIII EN ETE LEWIS S. Ol-IIOHESTER, OF JERSEY CITY, NEXVJERSEY, ASSIGNOR TO 0. M. EDWARD SGHROEDER, OF SAME PLACE.

AiR=COlVIPRESSOR.

SPECIFICATION forming part of Letters Patent No. 333,994, dated January12,1886.

Application filed November 10, 18 S4. Serial No. 148,282. (No model.)

To all whom it may concern:-

Be it known that I, Lnwrs S. CHIOHESTER, of Jersey City, in the countyof Hudson and State of New Jersey, have invented certain new and usefulImprovements in Air-Oompressors, of which the following is aspecification.

This invention has reference to improvements in that class of rotaryair-compressors [o for which an application for Letters Patent has beenfiled by me heretofore, under date of December 15, 1883, and Serial No.114,599, the improvements being designed with a view to simplify theconstruction of the same and r 5 render it more effective in action.

In the accompanying drawings, Figure 1 represents an end elevation of myimproved air-compressor. Fig. 2 is a vertical transverse sect-ion of thesame on line 00 00, Fig. 3. Fig.

2 is a detail side view and end view of one of the contact-rollers. Fig.3 is a side elevation; Fig. 4, a vertical longitudinal section of thesame on line'y y, Fig. 1. Fig. 4 is a detail side View and verticallongitudinal section of one of the roller-supporting bearings; and

Figs. 5 and 6 are respectively a vertical longitudinal section and avertical transverse section of a modified form of my improved aircompressor.

Similar letters of reference indicate correspending parts.

Referring to the drawings, A A represent the supporting-standards of myimproved aircompressor, which are securely attached to a 5 bed-plate, A.The standards A A carry in bearings at their upper ends the hollowshafts or trunnions B B of the heads 0 of an exterior cylindricalcasing, O. The trunnions communicate with enlarged chambers C O,

0 which are attached to the heads 0 G of the casing O. The casing O isprovided, preferably at three or more points, with radial compartments ra, which extend through the full length of the cylinder, and which serveto 5 guide the supporting bearings or shells r of the spring-cushionedcontact-rollers It. The compartments r for the contact-rollers R areencircled by a second cylinder, D, concentric to the casing G, whichouter cylinder serves for the belt by which the air-conias a pulley I Atboth sides of the rollerpressor is rotated. guiding compartments 1"chambers E E, which extend throughout the full length of the cylinder 0.The chambers E at one side of the roller-guiding compartments 1'communicate by radial pipes E with the chamber 0 and theinduction-trunniouB, while the chambers E at the other side of theroller-compartments communicate at their opposite ends by radial pipes Ewith the chamber G? and the eduction-trunnion B of the opposite cylinderhead. The air-chambers E E are provided with valved openings 6 e, thatcommunicate with the interior of the casing C. The contact-rollers B aremade of lignum-vitae, steel, or other suitable durable material, andheld in contact with an interior rubber-covered roller or piston, F, ofsteel or other metal, which is provided with anti-friction ringsf at theends, said rings having openings corresponding with oil-receivingpocketsf in the ends of the heavy roller F. The openings of the pocketsf are closed by felt plugs, so that small quantities of lubricatingmaterial are fed through. said plugs, so as to lubricate thecontact-faces of the rings f of the roller F, with the heads C" of thecasing O, and reduce thereby the friction between the heads and rolleras much as possible.

Owing to its gravity, the interior roller or piston, F,forms contact atits lower part with that part of the casing G at that time verticallybelow the same, so that no air can pass at that point. As the rollers Rare always held by their cushioningsprings in contact with the interiorpiston, F, and as the casingOrevolves around the same by the motionimparted by the belt and exterior pulley, D, the air is drawn in throughthe trunnion B and the valved chambers E to the interior of the casing0, compressed by the rotation of the same as the spaces between theinterior roller, F, and casing 0 are gradually diminished, and thenforced in compressed state through the valved openings of the chambersE, eduction-pipes E chamber C and trunnion B, to a reservoir or place ofuse.

For each revolution of the casing 0 three are arranged air-v separatebodies of air are drawn in and compressed, so that a nearly-continuouscompres s1on of' the air takes place, while the effect of 11:13individual compressions is hardly noticea e.

The eduction-chambers E air-ports 9, Fig. 2, with the roller-guidingcompartments r, so as to admit compressed air to the back of the rollerbearings or shells r andi'orm thereby an air-cushion. The supply of airis cut off as soon as the roller-bearings 'r' are moved back far enoughinto the compartments r 1- that the side walls of the bearlng close theair-ports 9. These air-cushions assist the cushioning springs of theroller hearings or shells r, secure the intimate contact of the rollerswith the interior roller or piston, and assist in the smooth andeffective running of the machine.

The ends of the contact-rollers and theside walls of the roller-bearingsare lubricated in the same manner as the end rings of the interiorpiston, F, by means of oil-pockets and fell; ilugs, as shown,respectively, in Figs. 2 an communicate by In place of arranging theroller-guiding compartments and the air induction and eduction chambersradially to and as a part of the casing 0, they can be arranged so as toeconomize space within the interior roller orpiston, F, as shown inFigs. 5 and 6. In this case the air-chambers G O are arranged as a partof the heads 0 of the exterior casing. 0, upon which is located directlythe pulleys D, for the driving-belt. The casing O is, in this-case,covered at its inner surface with a layer of rubber or other suitableelastic material.

The air-chambers O O communicate with the hollow trunnions B B and withthe airchambers E E, arranged at both sides of the roller-guidingcompartments 1' r. The airchambers E communicate with the air-chamber Oand trunnions B, while the air-chambers E communicate with theair-chambers O and trunnion B.

The exterior portion of the heads (3 forms contact with the end rings.f, of the roller F, the contact-faces being lubricated in the samemanner as in the device shown in Fig. 4, so that the friction betweenthem and the heads of the casing is reduced as much as possible.

The air-chambers E are provided with openings having valves opening intothe easing 0, so as to supply air to the spaces between the casing 0,interior roller, F. and the contact-rollers R B. By the rotation of thecasing G the air is compressed in said inte-' rior spaces and forcedthrough openings into the air-chambers E, the valves of which open tothe inside of said chambers. From the air-chambers E the compressed airis con ducted to the trunnion B and the place of use.

My improved air-compressorhas the advantage that an almost continuousbody of com pressed air can be supplied for use wherever required, thequantity of air compressed being increased with the increase of speed ofthe compressor and the pressure regulated in connection with a suitablereceiver connected to the eduction-trunnion.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of a rotating casing, 0, having anexterior pulley, D, an interior roller or piston, F, contact-rollers E,springcushioned guide-bearings r r for said rollers, roller-compartmentsr 1, air induction and eduction chambersE E, having valved openingscommunicating with the interior of the casing O, and air-ports g 9,connecting the eduction-chambers E with the roller-compartments r 1' inrear of the rollers, whereby air-cushions are formed behind saidrollers, substantially as and for the purpose set forth.

2. A roller provided with lubricating end pockets and with ananti-frictiou ring provided with holes opposite said pockets, said holesbeing adapted to receive felt plugs, through which the lubricant passes,substantially as described.

3. In an air-compressor, the combination of the rotary casing, theinterior rolling piston, spring-cushioned rollers bearing against theperiphery of said piston, radial compartments, and roller-bearings forsaid rollers, adapted to slide in said compartments, saidroller'bearings being provided with lubricating devices in their sidewalls, substantially as described.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

LEWIS S. OHIOHESTER. Vitnesses:

PAUL GOEPEL, SIDNEY MANN.

